Piston construction



...1L L.. HARMAN PISTON CONSTRUCTION Filed April l, 1939 2 SheeZS-Sheeil n Denim' PISTON CONSTRUCTION Filed; April l, 1939 2 She'lLS-Sheet 2Inventor Patented Mar. 11, 1941 F FICE PKSTON CNSTRUCTIN .l'ohn L.Harrah, on, Ohio Application April 1, 1939, Serial No., 265,5lii

l. Claim.

'This invention appertains to new and useful improvements in a pistonconstruction of the type especially adapted for use in and as a part ofan internal combustion engine.

The principal object of the present invention is to provide a sectionalpiston construction wherein the head is separable from the skirt portionso that said head can be easily removed for the purpose of replacementof piston rings and ,0 associated details without removing the completepiston entirely from'the cylinder.

Another important object of the invention is to provide a pistonconstruction wherein the head is separable from the skirt so that these'5 parts alone can be replaced without the necessity of replacing theentire piston.

Other objects and advantages of the invention will become apparent tothe reader of the following specication.

In the drawings- Figure 1 represents a top plan view.

Figure 2 is a section on the line 2--2 of Figure 1.

Figure 3 is a' top plan view of the skirt section.

Figure i is a side elevational view of the head.

Figure 5 is a bottom plan View of the head.

Figure 6 is a fragmentary detailed sectional view through the head.

Referring to the drawings wherein like numerals designate like parts, itcan be seen that numeral 5 represents the skirt section while numeral 6represents the head section of the piston.

The skirt section 5 has the wrist pin bearings l' therein and this skirtis, of course, of cylindrical construction. The upper portion of theskirt 5 has the inwardly disposed substantially thick annular formation8 which is reduced at o its outer portion to define the shoulder 9 overwhich the lower portion of the hollow head 6 slips as shown in Figure 2.

The head 6 has the ring grooves I0 and II and the open channel I2 at thebottom. of the head 5 6 in complement with the portion I3 at the top ofthe skirt 5 forms the third ring groove.

The top of the head 6 is bored to receive the socket screws I--il eachof which has a head seated in a counter-bore or countersink I5. Each(Cl. 3GB-15) oi these countersinks has opposed portions of its side wallformed with recesses to receive the end portions of a spring steel pinI6 which can be flexed with its ends inserted in the kerf il of thecorresponding socket screw head I8 and 5 released, of course, with thekeri aligned with the said recesses, to the end that the pin I6 willstraighten out and its ends engage into the recess, thus preventingrotation of the socket screw I4. These socket screws prior to the place-10 ment of the pins I6 are screwed downwardly over the upper ends of thebolts I9, said bolts extending upwardly through the formation 8 andbeing held in place by the jam nuts 2U.

0f course, placement of the head 6 over the 15 shoulder 9 aligns thebolts I9 properly with the opening in the head 6 for the screws, M,after which the screws I4 can be inserted through the openings androtated until the head is firmly secured to the skirt 5, after which thepins I6 20 are placed in the manner stated and the piston is completelyconstructed.

While the foregoing speciiication sets forth the invention in specicterms, it is to be understood that numerous changes in the shape, size25 and materials may be resorted to without departing from the'spiritand scope of the invention as claimed hereinafter.

Having described the invention, what is 30 claimed as new is:

In a piston construction, the combination of a cylindrical skirt portionentirely open at one end and formed with a thickened wall at itsopposite end, said wall being cut out at its up- 35 per peripheral edgeto form an annular seat extending flush with the edge of the skirtportion and extending inwardly and radially therefrom, a hollowcylindrical head having a depending skirt formed with a plurality ofcircumierentially extending spaced ribs forming intermediate thereofpiston ring receiving grooves, said depending skirt being adapted torest on said annular seat in the thickened Wall, the space below' thelowermost rib and the upper surface of said seat forming a groove toreceive an oil ring, and means carried by said skirt portion anddetachable head for holding the head on said skirt portion.

JOHN L. HARRAH.

